JPH09299457A - Antibacterial/deodorizing sanitary product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve safety, antibacterial effect and the sustainability of deodorizing effect by applying a coating of zinc oxide fine particles on the surface of a base body of a sanitary product with a specified average size without using a bonding material. SOLUTION: A coating of zinc oxide fine particles with an average size of below 0.1μm is applied on the surface of a base body for a sanitary product without using a bonding material to form an antibacterial and deodorizing sanitary product. In other words. preferably, a solution containing zinc ions is brought into contact with an alkali solution with the presence of the base body for the sanitary product so that zinc oxide is precipitated and applied on the surface of the base body for the sanitary product. In this case, the base body for the sanitary product may be brought into contact with the alkali aqueous solution under temperature conditions of above about 50 deg.C to react. The base body for the sanitary product herein usable is fiber products made of synthetic fibers or natural fibers, paper products or any other material. The material is used in any form and can be selected according to the purposes. But woven, unwoven cloths and the like are preferable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antibacterial / deodorant sanitary article, and more particularly to an antibacterial / deodorant sanitary article in which fine particles of zinc oxide are adhered to the surface of a sanitary article substrate without a binder.

[0002]

2. Description of the Related Art Hygiene products in which antibacterial components and deodorant components are carried (kneaded, impregnated, adhered, replaced) on a hygiene product substrate, or hygiene products in which materials supporting antibacterial components and deodorant components are woven into a hygiene product substrate Is known. For example, diapers woven with fine copper wires (Japanese Patent Laid-Open No. 53-67294) and hygiene articles made of cation exchange fibers substituted with antibacterial ions (Japanese Patent Laid-Open No. 5-212094) have been reported.

When an organic antibacterial component and a deodorant component are carried on the surface of a sanitary article substrate, the organic antibacterial ingredient and the deodorant component should be carried on the surface of the sanitary article substrate for a long period of time (that is, antibacterial effect). , It is difficult to maintain the deodorizing effect for a long period of time), and safety problems tend to occur due to the dissolution and scattering of the organic antibacterial components and deodorizing components. Further, there are inorganic antibacterial components such as silver zeolite and deodorizing components, but in order to fix this to the sanitary article substrate, it is necessary to adopt a method using a binder or a method of kneading into the hygienic article raw material resin, In this case, the antibacterial component and the deodorizing component are buried in the resin, so that they do not work effectively. Also, hygiene products to which antibacterial components and deodorizing components are added may cause a rash due to an allergic reaction.

Zinc oxide is known to have antibacterial and deodorant effects and to absorb moisture, and is also called zinc flower (sicca roll), which is used in the buttocks of babies to prevent diaper rash. It is known that it is extremely safe for the human body and has little allergic reaction. In order to use such an effective and safe zinc oxide, the zinc oxide is often fixed to a substrate and used. Conventionally, zinc oxide is fixed to a substrate by kneading it into a resin such as a molding material and then including it in a molded article such as fiber, or by dispersing zinc oxide in a paint to obtain a zinc oxide dispersion. A coating material was applied, or a dispersion liquid containing zinc oxide fine particles and a binder was applied, and heat treatment was performed for deposition. When kneading into the resin or dispersing it in the paint in this way, most of zinc oxide remains trapped in the resin and paint and is hard to appear on the surface, so the effect of adding zinc oxide is small, and However, when the paint is applied to a textile product, there is a drawback that uneven coating may occur.

When the dispersion liquid is applied, heat treatment is required to achieve evaporation of the dispersion medium and deposition with a binder. Further, the binder is attached to the surface of the zinc oxide fine particles and zinc oxide is added. It has the drawback of reducing effectiveness. There is also known a method in which a substrate is coated with zinc hydroxide and then thermally decomposed to coat zinc oxide.
It must be heated to 50 ° C. or higher, and may be deformed, deteriorated or melted depending on the material of the substrate. Further, the coating film is easily peeled off during heating, and it is difficult to obtain a strong zinc oxide adherend.

As a method for depositing zinc oxide on the surface of the substrate, a thermal spraying method can be considered, but in this case, the particle size of zinc oxide becomes several μm or more, and zinc oxides are fused to each other. For example, when it is applied to a textile product, the flexibility and tactile sensation of the substrate are lost and it becomes impractical. It is also possible to deposit zinc oxide by sputtering or vapor deposition, but in this case, it is possible to deposit only on the outermost surface of the substrate. Zinc cannot be applied.

[0007]

The object of the present invention is to use zinc oxide fine particles as an antibacterial component and a deodorant component, and the zinc oxide fine particles can be used as a binder on the surface of a sanitary article without causing the above-mentioned drawbacks. An object of the present invention is to provide an antibacterial / deodorant hygiene article which is firmly adhered to the human body, is safe for the human body, and has a continuous antibacterial effect and deodorizing effect.

[0008]

Means for Solving the Problems The present inventors have conducted various researches to achieve the above-mentioned object, and as a result, antibacterial action,
It has a deodorizing effect, can absorb moisture, and is extremely safe for the human body as it is used in the baby's buttocks to prevent diaper rash called zinc saccharol (siccaroll), and has little allergic reaction. The present invention has been completed by discovering that zinc oxide fine particles known to be capable of being firmly adhered to the surface of a sanitary article substrate without using a binder. That is, the antibacterial / deodorant hygiene article of the present invention has an average particle size of 0.1.
It is characterized in that zinc oxide fine particles of μm or less are adhered to the surface of the sanitary article substrate without a binder.

The antibacterial / deodorant hygiene article of the present invention is preferably prepared by contacting a zinc ion-containing solution with an alkaline aqueous solution in the presence of a hygiene article substrate to deposit and deposit zinc oxide on the surface of the hygiene article substrate. Antibacterial obtained by
It is a deodorant hygiene product. More preferably, the antibacterial / deodorant hygiene article of the present invention is such that the hygiene article substrate having the zinc ion-containing solution adhered to the surface of the hygiene article substrate is contacted and reacted with an alkaline aqueous solution under a temperature condition of 50 ° C or higher. An antibacterial / deodorant hygiene article obtained by depositing and depositing zinc oxide on the surface of the hygiene article substrate.

In the present invention, the sanitary article substrate to which the zinc oxide fine particles are applied may be any material such as synthetic fiber, natural fiber fiber product (woven cloth, non-woven cloth, etc.), paper product, or any shape, and sanitary article. Is appropriately selected according to the intended use. The sanitary article substrate is preferably a textile product such as a woven fabric or a non-woven fabric, or a paper product. In particular, when the material is a nonwoven fabric and zinc oxide is deposited on the surface of the nonwoven fabric, the antibacterial and deodorizing effect can be increased by reducing the amount of zinc oxide absorbed by the material.

As the antibacterial / deodorant hygiene article of the present invention, a diaper, a liner, a napkin, a cloth, a hand towel, a hand towel,
Examples include wet tissues. In the antibacterial / deodorant hygiene article of the present invention, the zinc oxide fine particles may be applied onto the surface of the hygiene article substrate even if it is applied to a woven fabric or a non-woven fabric before being processed into the hygiene article substrate shape. It may be performed after processing into a substrate shape. The zinc ion-containing solution used in the present invention is, for example, zinc sulfate, zinc chloride, zinc nitrate or the like dissolved in water, and the alkaline aqueous solution is, for example, sodium hydroxide, potassium hydroxide, lithium hydroxide or the like in water. It was dissolved in.

When the sanitary article substrate having the zinc ion-containing solution deposited on the surface of the sanitary article substrate is contacted with an aqueous alkali solution and reacted to obtain the antibacterial / deodorant sanitary article of the present invention, zinc ions are hygienic. It is preferable to contact and react with an alkaline aqueous solution while being in contact with the surface of the article substrate.
Further, when the zinc ion-containing solution is brought into contact with and reacted with the alkaline aqueous solution, it is preferably carried out under a temperature condition of 50 ° C. or higher. If the temperature is lower than 50 ° C., zinc oxide with few impurities tends to be difficult to obtain, and the reaction rate is slow, and zinc oxide fine particles with an average particle size of 0.1 μm or less are sufficiently deposited on the surface of the sanitary article substrate, It tends to be difficult to wear.

When the surface of the sanitary article substrate used in the present invention is hydrophobic, the surface of the sanitary article substrate is treated with, for example, a surfactant to make it hydrophilic, and then the zinc oxide fine particles are placed on the surface of the sanitary article substrate. The zinc oxide fine particles can be more firmly adhered to the surface of the sanitary article substrate by precipitating and adhering to the surface of the sanitary article substrate.

In the present invention, as described above, the hygiene article substrate having the zinc ion-containing solution deposited on the surface of the hygiene article substrate is contacted with an alkaline aqueous solution under a temperature condition of 50 ° C. or higher and immediately after the reaction. It is preferable to put it in a solution in which zinc oxide is sparingly soluble and to age it for 5 minutes or more under a temperature condition of 50 ° C. or higher. When the pH value of the zinc oxide hardly soluble solution is 9 or more, zinc oxide containing very few impurities is deposited, so that the pH value is preferably 9 or more. The temperature and time during the aging are such that zinc oxide fine particles having an average particle size of 0.1 μm or less can be sufficiently deposited and deposited on the surface of the sanitary article substrate. Zinc oxide with few impurities tends to be difficult to obtain, and the time required is too long. If it is less than 5 minutes, zinc oxide fine particles having an average particle size of 0.1 μm or less are sufficiently deposited on the surface of the sanitary article substrate. It tends to be difficult to apply.

By producing under the above-mentioned conditions, an antibacterial / deodorant hygiene article in which zinc oxide fine particles having an average particle size of 0.1 μm or less are adhered on the surface of the hygiene article substrate without a binder is obtained. In the present invention, "antibacterial" means
It means killing fungi such as E. coli and fungi,
“Deodorizing” means reducing the gas that gives off a bad odor, regardless of whether it is caused by decomposition, adsorption or a chemical reaction.

[0016]

【Example】

Example 1 A nonwoven fabric made of polypropylene fiber was treated with a surfactant to make its surface hydrophilic. This treated non-woven fabric is 60
Immediately after immersing in a zinc sulfate aqueous solution (2N) at 60 ° C. and taking it out, this nonwoven fabric is treated at 60 ° C.
It was immersed in N) and boiled at 60 ° C. for 20 minutes, and then the nonwoven fabric was washed with water and dried.

Regarding the non-woven fabric obtained by the above treatment, X
As a result of line diffraction, a diffraction peak of zinc oxide was confirmed. In addition, as a result of observing the nonwoven fabric surface with an electron microscope,
The zinc oxide fine particles having a particle size of 100 nm or less were almost uniformly adhered to the surface of the nonwoven fabric. The zinc oxide-coated non-woven fabric had almost no feel to the touch of the non-treated non-woven fabric, and the zinc oxide was not dropped or scattered even when the non-woven fabrics were rubbed together by hand.

The zinc oxide-coated non-woven fabric (10 cm × 10 cm) thus obtained was sealed in a glass container (volume: 9.2).
Liter), methyl mercaptan was injected to a concentration of 40 ppm, and the mixture was sealed. After 20 minutes, the methyl mercaptan concentration was 1 ppm or less. As described above, it was confirmed that the zinc oxide-coated nonwoven fabric had a deodorizing ability. This zinc oxide coated non-woven fabric is a diaper,
When used as a liner, a deodorizing effect sufficient for practical use was recognized.

Example 2 150 μl of a bacterial solution containing E. coli (containing about 20,000 E. coli) was added dropwise to the zinc oxide-coated nonwoven fabric prepared in Example 1.
Immediately after the dropping and 1, 2 and 3 hours later, the bacterial solution on the surface of the zinc oxide-coated non-woven fabric was collected and cultured on standard agar for 24 hours. For comparison, the same test was performed on a non-woven fabric having no zinc oxide coating. The test results are shown in Table 1. The data in Table 1 are converted values.

[0020]

Further, this non-woven fabric coated with zinc oxide was prepared according to Japanese Industrial Standard L0217 (1995). Washing (40 ° C.) was performed according to the washing method based on No. 103. When the cloth after washing was observed with an electron microscope, it was confirmed that zinc oxide was adhered even after washing. When this non-woven fabric coated with zinc oxide was used for sanitary items such as paper diapers, towels, and cloths, it showed sufficient antibacterial properties and was able to suppress bacterial growth in the sanitary items after use.

[0022]

INDUSTRIAL APPLICABILITY In the antibacterial / deodorant hygiene article of the present invention, zinc oxide fine particles having an average particle size of 0.1 μm or less are firmly adhered to the surface of the hygiene article substrate without a binder, and are safe for the human body. Therefore, it is possible to provide an antibacterial / deodorant hygiene article which has a small allergic reaction and continues the antibacterial effect and deodorant effect.

Claims (5)

[Claims] 1. An antibacterial / deodorant sanitary article, characterized in that zinc oxide fine particles having an average particle size of 0.1 μm or less are adhered to the surface of the sanitary article substrate without a binder. 2. The antibacterial agent according to claim 1, which is obtained by contacting a zinc ion-containing solution with an alkaline aqueous solution in the presence of a sanitary article substrate to deposit and deposit zinc oxide on the surface of the sanitary article substrate. Deodorant sanitary goods. 3. A surface of a sanitary article substrate having a zinc ion-containing solution adhering thereto is contacted with an aqueous alkali solution at a temperature of 50 ° C. or higher to react with it to oxidize the surface of the sanitary article substrate. The antibacterial / deodorant hygiene article according to claim 1, which is obtained by depositing and depositing zinc. 4. The antibacterial / deodorant hygiene article according to claim 1, 2 or 3, wherein the hygiene article substrate is a woven or non-woven fabric. 5. The antibacterial / deodorant hygiene article according to claim 1, 2, 3 or 4, wherein the antibacterial / deodorant hygiene article is a diaper or a liner.